[LeetCode]--171. Excel Sheet Column Number

Related to question Excel Sheet Column Title

Given a column title as appear in an Excel sheet, return its corresponding column number.

For example:

A -> 1 B -> 2 C -> 3 ... Z -> 26 AA -> 27 AB -> 28

Credits: Special thanks to @ts for adding this problem and creating all test cases.

问题应该并不复杂，就跟String转int一样，只是这是个26进制的数而已。

public int titleToNumber(String s) { if (s.length() == 0 || s == null) return 0; int sum = 0; for (int i = 0; i < s.length(); i++) { sum = sum * 26 + (s.charAt(i) - 'A' + 1); } return sum; }

一次就Accept！